A runner starts at the south-west corner of a rectangular field 60m long and 40m wide. He runs once around the perimeter and stops at the starting point. Which statement is true?
(a) Distance travelled is 200m and displacement is 72m
(b) Distance travelled is 100m and displacement is 0m
(c) Distance travelled is 200m and displacement is 0m
(d) Distance travelled is 0m and displacement is 200m